I have search for particular keyword group. About 3 days ago, the result was over 1 million. Then after a couple of hours the results gone down to about over 80,000 results. Then again today, it is showing 1 millioin results. The cycle is happening about 3 times. Why Google adsense results fluctuate a lot?
Google Adsense? Do you mean Google as in their search engine results? If so i've noticed that as well, but it seems for some keywords the number of results are back to normal, I think they might have been updating the SERPS??
^ but not from 1 mln to 80K Google have been drinking probably....my pr is gone somewhere, all 4 points!
The reason of such drastic fluctuation I guess due to universal search which affect search results, where users are searching through different keywords, that is really uncontrollable however you need close watch over changes and do more research.